Match Regex Pattern

Scans string matches regular expression pattern. Find and test JavaScript regex.

What are Regex Patterns?

Regular expressions are patterns used to match character combinations in string. When searching for a match that requires more than a direct match, such as finding one or more b's or white space, you can include special characters in the pattern.

For instance, the pattern /ab*c/ can be used to match a single "a" followed by zero or more "b"s, then "c": the * after "b" denotes "0 or more occurrences of the preceding item."

Using special characters

When searching for a match that requires more than a direct match, you can include special characters in the pattern, such as locating one or more b's or white space.

For example, you could use the pattern /ab*c/ to match a single "a" followed by zero or more "b"s followed by "c": the * after "b" implies "0 or more occurrences of the preceding item." In the string "cbbabbbbcdebc", this pattern will match the substring "abbbbc."

Regular Expressions Cheat Sheet

`[abc]`	A single character of: a, b, or c
`[^abc]`	Any single character except: a, b, or c
`[a-z]`	Any single character in the range a-z
`[a-zA-Z]`	Any single character in the range a-z or A-Z
`^`	Start of line
`$`	End of line
`\A`	Start of string
`\z`	End of string

`.`	Any single character
`\s`	Any whitespace character
`\S`	Any non-whitespace character
`\d`	Any digit
`\D`	Any non-digit
`\w`	Any word character (letter, number, underscore)
`\W`	Any non-word character
`\b`	Any word boundary

`(...)`	Capture everything enclosed
`(a\|b)`	a or b
`a?`	Zero or one of a
`a*`	Zero or more of a
`a+`	One or more of a
`a{3}`	Exactly 3 of a
`a{3,}`	3 or more of a
`a{3,6}`	Between 3 and 6 of a

options: i case insensitive m make dot match newlines x ignore whitespace in regex o perform #{...} substitutions only once

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